1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___ALGORITHM_RANGES_MIN_H 10*4bdff4beSrobert #define _LIBCPP___ALGORITHM_RANGES_MIN_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__algorithm/ranges_min_element.h> 13*4bdff4beSrobert #include <__assert> 14*4bdff4beSrobert #include <__concepts/copyable.h> 15*4bdff4beSrobert #include <__config> 16*4bdff4beSrobert #include <__functional/identity.h> 17*4bdff4beSrobert #include <__functional/invoke.h> 18*4bdff4beSrobert #include <__functional/ranges_operations.h> 19*4bdff4beSrobert #include <__iterator/concepts.h> 20*4bdff4beSrobert #include <__iterator/projected.h> 21*4bdff4beSrobert #include <__ranges/access.h> 22*4bdff4beSrobert #include <__ranges/concepts.h> 23*4bdff4beSrobert #include <initializer_list> 24*4bdff4beSrobert 25*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 26*4bdff4beSrobert # pragma GCC system_header 27*4bdff4beSrobert #endif 28*4bdff4beSrobert 29*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 30*4bdff4beSrobert 31*4bdff4beSrobert _LIBCPP_PUSH_MACROS 32*4bdff4beSrobert #include <__undef_macros> 33*4bdff4beSrobert 34*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 35*4bdff4beSrobert 36*4bdff4beSrobert namespace ranges { 37*4bdff4beSrobert namespace __min { 38*4bdff4beSrobert struct __fn { 39*4bdff4beSrobert template <class _Tp, class _Proj = identity, 40*4bdff4beSrobert indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less> 41*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr operator__fn42*4bdff4beSrobert const _Tp& operator()(const _Tp& __a, const _Tp& __b, _Comp __comp = {}, _Proj __proj = {}) const { 43*4bdff4beSrobert return std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)) ? __b : __a; 44*4bdff4beSrobert } 45*4bdff4beSrobert 46*4bdff4beSrobert template <copyable _Tp, class _Proj = identity, 47*4bdff4beSrobert indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less> 48*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr operator__fn49*4bdff4beSrobert _Tp operator()(initializer_list<_Tp> __il, _Comp __comp = {}, _Proj __proj = {}) const { 50*4bdff4beSrobert _LIBCPP_ASSERT(__il.begin() != __il.end(), "initializer_list must contain at least one element"); 51*4bdff4beSrobert return *ranges::__min_element_impl(__il.begin(), __il.end(), __comp, __proj); 52*4bdff4beSrobert } 53*4bdff4beSrobert 54*4bdff4beSrobert template <input_range _Rp, class _Proj = identity, 55*4bdff4beSrobert indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less> 56*4bdff4beSrobert requires indirectly_copyable_storable<iterator_t<_Rp>, range_value_t<_Rp>*> 57*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr operator__fn58*4bdff4beSrobert range_value_t<_Rp> operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const { 59*4bdff4beSrobert auto __first = ranges::begin(__r); 60*4bdff4beSrobert auto __last = ranges::end(__r); 61*4bdff4beSrobert 62*4bdff4beSrobert _LIBCPP_ASSERT(__first != __last, "range must contain at least one element"); 63*4bdff4beSrobert 64*4bdff4beSrobert if constexpr (forward_range<_Rp>) { 65*4bdff4beSrobert return *ranges::__min_element_impl(__first, __last, __comp, __proj); 66*4bdff4beSrobert } else { 67*4bdff4beSrobert range_value_t<_Rp> __result = *__first; 68*4bdff4beSrobert while (++__first != __last) { 69*4bdff4beSrobert if (std::invoke(__comp, std::invoke(__proj, *__first), std::invoke(__proj, __result))) 70*4bdff4beSrobert __result = *__first; 71*4bdff4beSrobert } 72*4bdff4beSrobert return __result; 73*4bdff4beSrobert } 74*4bdff4beSrobert } 75*4bdff4beSrobert }; 76*4bdff4beSrobert } // namespace __min 77*4bdff4beSrobert 78*4bdff4beSrobert inline namespace __cpo { 79*4bdff4beSrobert inline constexpr auto min = __min::__fn{}; 80*4bdff4beSrobert } // namespace __cpo 81*4bdff4beSrobert } // namespace ranges 82*4bdff4beSrobert 83*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 84*4bdff4beSrobert 85*4bdff4beSrobert _LIBCPP_POP_MACROS 86*4bdff4beSrobert 87*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 && 88*4bdff4beSrobert 89*4bdff4beSrobert #endif // _LIBCPP___ALGORITHM_RANGES_MIN_H 90